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113 lines
3.2 KiB
113 lines
3.2 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is an open source project management software.
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# Copyright (C) 2012-2020 the OpenProject GmbH
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See docs/COPYRIGHT.rdoc for more details.
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#++
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class Color < ActiveRecord::Base
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self.table_name = 'colors'
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has_many :planning_element_types, class_name: 'Type',
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foreign_key: 'color_id',
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dependent: :nullify
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before_validation :normalize_hexcode
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validates_presence_of :name, :hexcode
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validates_length_of :name, maximum: 255, unless: lambda { |e| e.name.blank? }
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validates_format_of :hexcode, with: /\A#[0-9A-F]{6}\z/, unless: lambda { |e| e.hexcode.blank? }
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##
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# Returns the best contrasting color, either white or black
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# depending on the overall brightness.
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def contrasting_color(light_color: '#FFFFFF', dark_color: '#333333')
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if bright?
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dark_color
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else
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light_color
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end
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end
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##
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# Get the fill style for this color.
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# If the color is light, use a dark font.
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# Otherwise, use a white font.
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def color_styles(light_color: '#FFFFFF', dark_color: '#333333')
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if bright?
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{ color: dark_color, 'background-color': hexcode }
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else
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{ color: light_color, 'background-color': hexcode }
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end
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end
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##
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# Returns whether the color is bright according to
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# YIQ lightness.
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def bright?
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brightness_yiq >= 128
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end
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##
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# Returns whether the color is very bright according to
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# YIQ lightness.
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def super_bright?
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brightness_yiq >= 200
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end
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##
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# Sum the color values of each channel
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# Same as in frontend color-contrast.functions.ts
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def brightness_yiq
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r, g, b = rgb_colors
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((r * 299) + (g * 587) + (b * 114)) / 1000;
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end
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##
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# Splits the hexcode into rbg color array
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def rgb_colors
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hexcode
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.gsub('#', '') # Remove trailing #
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.scan(/../) # Pair hex chars
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.map { |c| c.hex } # to int
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end
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protected
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def normalize_hexcode
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if hexcode.present? and hexcode_changed?
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self.hexcode = hexcode.strip.upcase
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unless hexcode.starts_with? '#'
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self.hexcode = '#' + hexcode
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end
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if hexcode.size == 4 # =~ /#.../
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self.hexcode = hexcode.gsub(/([^#])/, '\1\1')
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end
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end
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end
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end
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